A study on motion characteristics of the forced vibration of a floating body in two-degree-of-freedom machine gun system with impact and momentum offset

Abstract

Floating technology is an emerging firearm recoil reduction technique. Firearms utilizing this technology differ significantly from traditional firearm systems, featuring distinctive characteristics of a two-degree-of-freedom system. This paper presents a novel model for this floating principle machine gun, incorporating a bi-directional buffer spring. The model is established and validated against experimental results. The experiment reveals both the floating body and the automaton body exhibit quasi-harmonic motion with some randomness. An observed impact and momentum offset between the floating body and the automaton body show an offset efficiency of 29%. The stiffness of the two springs is thoroughly analyzed regarding its influence on the floating characteristics, especially the backward ending state of the bi-direction floating body, offset efficiency, and triggering consistency. Increasing the stiffness of the bi-direction floating spring raises the bi-direction floating body’s motion frequency, resulting in a delayed phase at triggering time. Likewise, augmenting the automaton spring stiffness increases its motion frequency and advances the bi-direction floating body’s phase at triggering time. These adjustments affect the relative phase between the bi-direction floating body and the automaton body, thus impacting the backward ending state, offset efficiency, and consistency.